Dear Lists:

I had  a matrix which has lrt score for my microarray data. I just wonder
how to visualize them with score over 20 in particular color such as blue.
I cannot understand the color relationship with the value in z matrix. For
example, If I see a red color in my image generated by image function. I
don't know what is the value of z in that spot.
Example:
aaa <- matrix(rnorm(36),4,9)
image(aaa)

Can I paint the cells at which their values are higher than a certain value
in image()?
Or I have to use some other functions,

best

Shiliang

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